get the name of the key, in array of objects - JS

Question

I have an array for instance

humans:[
  dave: {
   ...daveData
  },
  mike: { 
   ...mikeData
  }
]

now calling human[0] returns {..daveData} but how can I get the NAME of the KEY meaning 'dave', 'mike' as a string ... sorry if I'm repeating myself, but I didn't find similar questions.

Also to say im using React to render

tags using array.map()

Hi there, the code example you provided is not valid JavaScript format. Can you provide working code? — Patrick Hund
– Patrick Hund, Commented Feb 6, 2018 at 11:30
I'm pulling the data from Firebase ... firebase creates for me an array of objects, each object has some "-L4eimbEHuoYMpmkGVTs" random Id ... and i need this ID as a string — Георги Димитранов
– Георги Димитранов, Commented Feb 6, 2018 at 11:32
Did you mean: {humans:[{dave: {...}}, {mike: { ... }}]} or [{dave: {...}}, {mike: { ... }}]?? — Ele
– Ele, Commented Feb 6, 2018 at 11:33

Daniel Conde Marin · Accepted Answer · 2018-02-06 11:42:03Z

1

Your array is invalid, assuming from the comments your array is like this:

const humans = [
  {
   dave: 'bar' // or whatever, doesn't need to be a string
  },
  {
   mike: 'baz'
  }
];

then you could:

const humans = [
  {
   dave: 'bar'
  },
  {
   mike: 'baz'
  }
];

const myKeys = humans.map(x => Object.keys(x)[0]);

console.log(myKeys)

edited Feb 6, 2018 at 11:42

answered Feb 6, 2018 at 11:35

Daniel Conde Marin

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Ele · Accepted Answer · 2018-02-06 11:42:01Z

0

You can use reduce function and spread operator.

Look at this code snippet

var data = [{dave: {}}, {mike: {}}, {'Георги': {}}, {'Димитранов': {}}];

var results = data.reduce((a, c) => [...a, ...Object.keys(c)], []);

console.log(results);

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edited Feb 6, 2018 at 11:42

answered Feb 6, 2018 at 11:36

Ele

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